CN102185332A - Method for controlling exchanging power between microgrid and large power grid - Google Patents

Method for controlling exchanging power between microgrid and large power grid Download PDF

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CN102185332A
CN102185332A CN2011101192715A CN201110119271A CN102185332A CN 102185332 A CN102185332 A CN 102185332A CN 2011101192715 A CN2011101192715 A CN 2011101192715A CN 201110119271 A CN201110119271 A CN 201110119271A CN 102185332 A CN102185332 A CN 102185332A
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microgrid
energy
exchange
electrical network
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严玉廷
卢勇
杨晴
苏适
冯勇
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Yunnan Electric Power Test and Research Institute Group Co Ltd
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Abstract

The invention provides a method for controlling exchanging power between a microgrid and a large power grid, which is characterized in that advanced application software in the microgrid is utilized to predict photovoltaic power generation, 24-hour generated energy of wind power generation and 24-hour power consumption in the microgrid, and calculate the allowable charge-discharge capacity and the controllable power generation unit power of an energy type stored energy unit, thus determining the regulating range of exchanging the power between the microgrid and the large power grid; and a microgrid energy management system coordinates output of the stored energy unit and a controllable power generation unit in accordance with an order of exchanging the power sent from a district power grid scheduling system, and realizes the exchange of the power between the microgrid and the large power grid so as to reach a control target. The method is utilized to control the exchange of the power by the microgrid in accordance with a district power grid scheduling order, thus reflecting controllability of the microgrid relative to the large power grid, thereby indirectly solving the problems of intermittency, no control and the like of a distributed power supply, and being beneficial to improving absorptive capability of the microgrid for distributed intermittent energy sources.

Description

The exchange Poewr control method of microgrid and big electrical network
Technical field
The invention belongs to new forms of energy and use and the microgrid technology, especially relate to a kind of method and technology field of the exchange power of microgrid and big electrical network.
Background technology
Microgrid is one of important form of distributed power generation, and microgrid is meant the miniature electric power system that is made of distributed power source, energy storage device, power distribution network, load, control system and power electronics interface etc.Distributed power source comprises the uncontrollable renewable power supplies at random of primary energy such as wind energy, solar energy, there is the once efficient power of the controlled energy such as miniature gas turbine, fuel cell, cogeneration unit again, also exist storage battery, ultracapacitor or the like for peak load shifting, stabilize the energy-storage system of output-power fluctuation, couple together by power distribution network and load between them, just constituted a miniature electric power system.This system both can independently move, by the load power supply of distributed power source to microgrid inside; Also can be incorporated into the power networks, confess unnecessary electric power or replenish the deficiency of microgrid self generating amount by electrical network to big electrical network.
Exchange Poewr control method when being incorporated into the power networks by the research microgrid, the realization microgrid is controlled with respect to big electrical network, thereby problem such as solve the distributed power source intermittence indirectly, do not control helps improving the ability to arrange jobs of electrical network to distributed intermittent energy source, has also increased the regulating measure of electrical network.
Summary of the invention
The exchange Poewr control method that the purpose of this invention is to provide a kind of microgrid and big electrical network realizes that microgrid exchanges power control by big dispatching of power netwoks instruction.
The present invention is achieved through the following technical solutions:
The exchange Poewr control method of microgrid and big electrical network, realize that microgrid exchanges power control by the regional power grid scheduling instruction, is characterized in that this method step comprises:
1, the 24 hours energy output of photovoltaic generation, wind power generation in the microgrid advanced applied software prediction microgrid are predicted 24 hours power consumptions, and calculating energy type energy-storage units allows charge/discharge capacity, calculates controlled generator unit power regulating range.Microgrid can be sent power to electrical network, also can absorb big grid power; The exchange power bracket:
U_Lim_P?=?K1*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load+?Dsch_E Strge）/24?+?P Gen_Max）
L_Lim_P?=?K2*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load-?Ch_E Strge）/24）
Wherein, U_Lim_P is that microgrid is sent power upper limit to big electrical network, and L_Lim_P is that microgrid is sent the power lower limit to big electrical network; K1, K2 are proportionality coefficient; Frcst_E PV, Frcst_E WindBe respectively 24 hours photovoltaic generation amounts, the wind power generation amount of prediction; Frcst_E LoadIt is 24 hours prediction power consumption; Dsch_E StrgeFor the energy type energy-storage units allows discharge capacity, Ch_E StrgeFor the energy type energy-storage units allows charge volume; P Gen_MaxBe controlled generator unit peak power output;
2, according to the result of calculation in the step 1, the microgrid advanced applied software is uploaded power network dispatching system with the allowed band of microgrid and area power grid exchange power;
3, the regional power grid scheduling system requires (Ru Feng, paddy, the different capacity of flat three periods require) and microgrid to allow the exchange power bracket according to operation of power networks, provide the microgrid and big electrical network exchange power instruction of different time sections, and being issued to the microgrid advanced applied software at interval with Fixed Time Interval or transformation period, Fixed Time Interval can be selected for use 1 hour, 30 minutes or 5 minutes;
4, the exchange power instruction that issues with big dispatching of power netwoks of microgrid advanced applied software is a controlled target, according to the load power in the current microgrid, photovoltaic generation power, wind power generation power, with the set time every calculating power deviation Δ P, Fixed Time Interval can be selected 30 seconds;
ΔP?=?P PV?+?P Wind-?P Load+?P Change
Wherein, P PVBe current photovoltaic generation power;
P WindBe current wind power generation power;
P LoadFor the load in the current microgrid carries power;
P ChangeBe microgrid and big electrical network exchange power, send power for just, receive power for negative to electrical network;
5, the microgrid advanced applied software is after calculating energy type energy-storage units allows the upper lower limit value of capacity and power upper lower limit value and operating cost that operating cost, controlled generator unit allow, power deviation Δ P with calculating, carry out power division between energy type energy-storage units and controlled generator unit:
ΔP?=?f(Storage)*P Str?+?f(Gen)*P Gen
Wherein, f (Storage) is for considering the power division polygronal function under energy-storage units capacity upper lower limit value and the fee condition, and f (Gen) is for considering the power division polygronal function under controlled generator unit power upper lower limit value and the fee condition; P StrBe the distribution power of energy type energy-storage units, P GenDistribution power for controlled generator unit;
6, the power control instruction of the real-time rated output type of microgrid advanced applied software energy-storage units (ultracapacitor etc.) is used to stabilize the rapid fluctuations of microgrid and big electrical network exchange power.Its instruction:
P EDLC?=?（K P?+?K I/s）（ -?P Change）
Wherein, K PBe proportionality constant, K IBe integral constant,
Figure 244331DEST_PATH_IMAGE002
Average for several sampled values;
7, abnormality processing: 1) when the energy type energy-storage units reaches the bound capacity, recomputate microgrid and big electrical network exchange power bracket, and adjust f (Storage); 2) when out of service, recomputate microgrid and big electrical network exchange power bracket because of unusual when controlled generator unit, and to adjust f (Gen) be zero; 3) the microgrid advanced applied software is judged the prediction of distributed power generation unit energy output, load electricity demand forecasting when big than the actual value deviation, revise the input parameter of forecasting software module, again carry out energy output and electricity demand forecasting, adjust microgrid and big electrical network exchange power bracket then; 4) the photovoltaic generation unit, when the wind power generation unit exception withdraws from, recomputate microgrid and big electrical network exchange power bracket; 5) big electric network fault or when having a power failure withdraws from the exchange power control mode, carries out the lonely network operation control model of microgrid.
The invention has the beneficial effects as follows, realized that microgrid exchanges the control of power by the regional power grid scheduling instruction, make microgrid embody controllability with respect to big electrical network, thereby problem such as solve the distributed power source intermittence indirectly, do not control helps improving the ability to arrange jobs of electrical network to distributed intermittent energy source.
Below in conjunction with the drawings and specific embodiments to further detailed explanation of the specific embodiment of the present invention.
Description of drawings
Fig. 1 is the connection diagram of microgrid of the present invention and big electrical network;
Fig. 2 is that microgrid of the present invention is controlled block diagram with the exchange power of big electrical network.
Embodiment
The exchange Poewr control method of microgrid and big electrical network exchanges the control of power in order to realize microgrid by the regional power grid scheduling instruction, and the inventive method step comprises:
24 hours energy output of photovoltaic generation, wind power generation in A, the microgrid advanced applied software prediction microgrid, 24 hours power consumptions of microgrid, and calculating energy type energy-storage units permission charge/discharge capacity and controlled generator unit power regulating range, thereby determine microgrid and big electrical network exchange power bracket; Microgrid can be sent power to electrical network, also can absorb big grid power; The exchange power bracket:
U_Lim_P?=?k1*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load+?Dsch_E Strge）/24?+?P Gen_Max）
L_Lim_P?=?k2*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load-?Ch_E Strge）/24）
Wherein, U_Lim_P is that microgrid is sent power upper limit to big electrical network, and L_Lim_P is that microgrid is sent the power lower limit to big electrical network; K1, k2 are proportionality coefficient; Frcst_E PV, Frcst_E WindBe respectively 24 hours photovoltaic generation amounts, the wind power generation amount of prediction; Frcst_E LoadIt is 24 hours electricity consumption premeasuring; Dsch_E StrgeFor the energy type energy-storage units allows discharge capacity, Ch_E StrgeFor the energy type energy-storage units allows charge volume; P Gen_MaxBe controlled generator unit peak power output;
B, according to the result of calculation in the steps A, the allowed band of uploading microgrid and area power grid exchange power is to the regional power grid scheduling system; The regional power grid scheduling system allows the exchange power bracket according to operation of power networks requirement and microgrid, provides the microgrid and big electrical network exchange power instruction of different time sections, and is issued to the microgrid advanced applied software at interval with Fixed Time Interval or transformation period;
The exchange power instruction that C, microgrid advanced applied software issue with regional power grid scheduling is a controlled target, according to the load power in the current microgrid, photovoltaic generation power, wind power generation power, calculates power deviation Δ P with Fixed Time Interval;
ΔP?=?P PV?+?P Wind-?P Load+?P Change
Wherein, P PVBe current photovoltaic generation power;
P WindBe current wind power generation power;
P LoadFor the load in the current microgrid carries power;
P ChangeBe microgrid and big electrical network exchange power, send power for just, receive power for negative to electrical network;
D, microgrid advanced applied software calculate the energy type energy-storage units and allow the upper lower limit value of capacity and power upper lower limit value and the operating cost that operating cost, controlled generator unit allow, and then power deviation Δ P are carried out power division between energy type energy-storage units and controlled generator unit:
ΔP?=?f(Storage)*P Str?+?f(Gen)*P Gen
Wherein, f (Storage) is for having considered the power division polygronal function under energy type energy-storage units capacity upper lower limit value and the fee condition, and f (Gen) is for considering the power division polygronal function under controlled generator unit power upper lower limit value and the fee condition; P StrBe the distribution power of energy type energy-storage units, P GenDistribution power for controlled generator unit;
The power control instruction of E, the real-time rated output type of microgrid advanced applied software energy-storage units is used to stabilize the rapid fluctuations of microgrid and big electrical network exchange power; Its instruction:
P EDLC?=?（K P?+?K I/s）（
Figure 189153DEST_PATH_IMAGE001
-?P Change）
Wherein, K PBe proportionality coefficient, K IBe integral coefficient,
Figure 541637DEST_PATH_IMAGE002
Average for sampled value;
F, abnormality processing: when energy type energy-storage units, controlled generator unit, photovoltaic generation unit, blower fan generate electricity when unusual, or control appliance appears when out-of-limit greatly because of energy output prediction, electricity demand forecasting deviation, re-execute steps A and calculate the exchange power bracket, and set up exchange power target value on their own, then new exchange power bracket is uploaded big power network dispatching system; When big electric network fault or power failure, withdraw from the Power Exchange control model, carry out the lonely network operation pattern of microgrid.
As shown in Figure 1, microgrid carries out Power Exchange by interconnection and big electrical network when being incorporated into the power networks with big electrical network.Can management system pass through the fiber optic Ethernet network by microgrid, adopt ICP/IP protocol and regional power grid scheduling system communication.And uploading the allowed band of microgrid and big electrical network exchange power, the regional power grid scheduling system issues corresponding exchange power instruction to the microgrid advanced applied software according to rich, the paddy of whole day load, section at ordinary times thereafter.
The microgrid advanced applied software is carried out the power division between controlled generator unit, energy energy-storage units in the microgrid according to control flow shown in Figure 2.Simultaneously, will exchange power is controlled target, will obtain the power output command value of power-type energy-storage units with the input variable of the departure between the actual amount measured value as the PI controlling unit.
When microgrid can management system be judged equipment in the microgrid and had abnormality, enter the abnormality processing flow process.

Claims (1)

1. the exchange Poewr control method of microgrid and big electrical network exchanges the control of power in order to realize microgrid by the regional power grid scheduling instruction, it is characterized in that this method step comprises:
24 hours energy output of photovoltaic generation, wind power generation in A, the microgrid advanced applied software prediction microgrid, 24 hours power consumptions of microgrid, and calculating energy type energy-storage units permission charge/discharge capacity and controlled generator unit power regulating range, thereby determine microgrid and big electrical network exchange power bracket; Microgrid can be sent power to electrical network, also can absorb big grid power; The exchange power bracket:
U_Lim_P?=?k1*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load+?Dsch_E Strge）/24?+?P Gen_Max）
L_Lim_P?=?k2*?（（Frcst_E PV+?Frcst_E Wind-?Frcst_E Load-?Ch_E Strge）/24）
Wherein, U_Lim_P is that microgrid is sent power upper limit to big electrical network, and L_Lim_P is that microgrid is sent the power lower limit to big electrical network; K1, k2 are proportionality coefficient; Frcst_E PV, Frcst_E WindBe respectively 24 hours photovoltaic generation amounts, the wind power generation amount of prediction; Frcst_E LoadIt is 24 hours electricity consumption premeasuring; Dsch_E StrgeFor the energy type energy-storage units allows discharge capacity, Ch_E StrgeFor the energy type energy-storage units allows charge volume; P Gen_MaxBe controlled generator unit peak power output;
B, according to the result of calculation in the steps A, the allowed band of uploading microgrid and area power grid exchange power is to the regional power grid scheduling system; The regional power grid scheduling system allows the exchange power bracket according to operation of power networks requirement and microgrid, provides the microgrid and big electrical network exchange power instruction of different time sections, and is issued to the microgrid advanced applied software at interval with Fixed Time Interval or transformation period;
The exchange power instruction that C, microgrid advanced applied software issue with regional power grid scheduling is a controlled target, according to the load power in the current microgrid, photovoltaic generation power, wind power generation power, calculates power deviation Δ P with Fixed Time Interval;
ΔP?=?P PV?+?P Wind-?P Load+?P Change
Wherein, P PVBe current photovoltaic generation power;
P WindBe current wind power generation power;
P LoadFor the load in the current microgrid carries power;
P ChangeBe microgrid and big electrical network exchange power, send power for just, receive power for negative to electrical network;
D, microgrid advanced applied software calculate the energy type energy-storage units and allow the upper lower limit value of capacity and power upper lower limit value and the operating cost that operating cost, controlled generator unit allow, and then power deviation Δ P are carried out power division between energy type energy-storage units and controlled generator unit:
ΔP?=?f(Storage)*P Str?+?f(Gen)*P Gen
Wherein, f (Storage) is for having considered the power division polygronal function under energy type energy-storage units capacity upper lower limit value and the fee condition, and f (Gen) is for considering the power division polygronal function under controlled generator unit power upper lower limit value and the fee condition; P StrBe the distribution power of energy type energy-storage units, P GenDistribution power for controlled generator unit;
The power control instruction of E, the real-time rated output type of microgrid advanced applied software energy-storage units is used to stabilize the rapid fluctuations of microgrid and big electrical network exchange power; Its instruction:
P EDLC?=?（K P?+?K I/s）（
Figure 596307DEST_PATH_IMAGE001
-?P Change）
Wherein, K PBe proportionality coefficient, K IBe integral coefficient,
Figure 34241DEST_PATH_IMAGE002
Average for sampled value;
F, abnormality processing: when energy type energy-storage units, controlled generator unit, photovoltaic generation unit, blower fan generate electricity when unusual, or control appliance appears when out-of-limit greatly because of energy output prediction, electricity demand forecasting deviation, re-execute steps A and calculate the exchange power bracket, and set up exchange power target value on their own, then new exchange power bracket is uploaded big power network dispatching system; When big electric network fault or power failure, withdraw from the Power Exchange control model, carry out the lonely network operation pattern of microgrid.
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CN102496956A (en) * 2011-11-25 2012-06-13 北京金风科创风电设备有限公司 Mode switching method for switching grid-connected mode to island mode of microgrid
CN102510089A (en) * 2011-11-25 2012-06-20 北京金风科创风电设备有限公司 Wind-solar storage micro-grid system
CN102548135A (en) * 2011-12-15 2012-07-04 深圳市新天光电科技有限公司 Solar energy controller and realizing method thereof
CN102611127A (en) * 2012-02-17 2012-07-25 中国电力科学研究院 Control method for unifying self-balancing and self-smoothing of micro-grid
CN102684199A (en) * 2012-06-05 2012-09-19 国电南瑞科技股份有限公司 Multiple time scale control method of exchange power of microgrid and power distribution network
CN102810877A (en) * 2012-08-21 2012-12-05 湖南大学 Integrated microgrid control method
CN103337946A (en) * 2013-07-10 2013-10-02 温州大学 Megawatt on/off-network converter composite filter
CN104753081A (en) * 2013-12-30 2015-07-01 华为技术有限公司 Microgrid power supply control method and device
CN106548291A (en) * 2016-11-07 2017-03-29 国网山东省电力公司电力科学研究院 A kind of micro-capacitance sensor on-road efficiency distribution method based on Shapley values
CN107834574A (en) * 2017-07-31 2018-03-23 上海电气分布式能源科技有限公司 A kind of distributed energy resource system exchanges the control method of power with power network
CN108599232A (en) * 2018-03-27 2018-09-28 中国电力科学研究院有限公司 A kind of the wind-light storage energy exchange control method and system of virtual synchronous generator
CN108964022A (en) * 2018-06-28 2018-12-07 南京南瑞继保电气有限公司 A kind of power coordination control method suitable for large capacity microgrid
CN115622087A (en) * 2022-12-05 2023-01-17 国网天津市电力公司电力科学研究院 Power regulation and control method, device and equipment for power distribution network

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CN102496956A (en) * 2011-11-25 2012-06-13 北京金风科创风电设备有限公司 Mode switching method for switching grid-connected mode to island mode of microgrid
CN102510089A (en) * 2011-11-25 2012-06-20 北京金风科创风电设备有限公司 Wind-solar storage micro-grid system
CN102412594A (en) * 2011-11-25 2012-04-11 北京金风科创风电设备有限公司 Control Method of Microgrid System
CN102412594B (en) * 2011-11-25 2013-11-27 北京金风科创风电设备有限公司 Control Method of Microgrid System
CN102496956B (en) * 2011-11-25 2014-10-22 北京金风科创风电设备有限公司 Mode switching method for switching grid-connected mode to island mode of microgrid
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CN102611127A (en) * 2012-02-17 2012-07-25 中国电力科学研究院 Control method for unifying self-balancing and self-smoothing of micro-grid
WO2013120347A1 (en) * 2012-02-17 2013-08-22 中国电力科学研究院 Control method for unifying self-balancing and self-smoothing of micro-grid
CN102611127B (en) * 2012-02-17 2014-12-03 中国电力科学研究院 Control method for unifying self-balancing and self-smoothing of micro-grid
CN102684199B (en) * 2012-06-05 2015-04-08 国电南瑞科技股份有限公司 Multiple time scale control method of exchange power of microgrid and power distribution network
CN102684199A (en) * 2012-06-05 2012-09-19 国电南瑞科技股份有限公司 Multiple time scale control method of exchange power of microgrid and power distribution network
CN102810877A (en) * 2012-08-21 2012-12-05 湖南大学 Integrated microgrid control method
CN103337946A (en) * 2013-07-10 2013-10-02 温州大学 Megawatt on/off-network converter composite filter
CN103337946B (en) * 2013-07-10 2015-08-19 温州大学 A kind of MW class also/from net converter composite filter
CN104753081A (en) * 2013-12-30 2015-07-01 华为技术有限公司 Microgrid power supply control method and device
CN104753081B (en) * 2013-12-30 2018-02-06 华为技术有限公司 A kind of method and apparatus for controlling micro-capacitance sensor power supply
CN106548291A (en) * 2016-11-07 2017-03-29 国网山东省电力公司电力科学研究院 A kind of micro-capacitance sensor on-road efficiency distribution method based on Shapley values
CN107834574A (en) * 2017-07-31 2018-03-23 上海电气分布式能源科技有限公司 A kind of distributed energy resource system exchanges the control method of power with power network
CN107834574B (en) * 2017-07-31 2022-03-18 上海电气分布式能源科技有限公司 Control method for power exchange between distributed energy system and power grid
CN108599232A (en) * 2018-03-27 2018-09-28 中国电力科学研究院有限公司 A kind of the wind-light storage energy exchange control method and system of virtual synchronous generator
CN108599232B (en) * 2018-03-27 2021-04-30 中国电力科学研究院有限公司 Wind-solar energy storage exchange control method and system of virtual synchronous generator
CN108964022A (en) * 2018-06-28 2018-12-07 南京南瑞继保电气有限公司 A kind of power coordination control method suitable for large capacity microgrid
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